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Diamond Member

The designs are way too different for any kind of proper comparison. I haven't worked too much on recent Intel designs, but I would say AMD has better power management than the most recent Intel designs do. That's the result of being so far behind in both the process technology and the design itself, however that's definitely not a bad thing.

Once AMD has access to smaller manufacturing process (such as the 14nm LPP) their power efficiency will be pretty hard to compete with. Let's just hope the new architechture lives up to the expectations.

While the power management in Carrizo for example is extremely advanced and effective, there are still some things which need to be improved heavily. Basically none of the features of the power management are documented, let alone properly. Because the lack of documentation, the system manufacturers are unable to tune the power management properly to provide the best possible performance on their system.

I have personally spent maybe < 800 hours on the SMU, PMU and PMC on Steamroller and Excavator. Without the breakthroughs I made on Steamroller (i.e learnt how to program and configure the SMU) I couldn't change a single setting either on Steamroller or Excavator, despite having access to the same documents as the manufacturers do. Most of the time the stuff just isn't documented at all and when it is, it is done either poorly or just wrong.

Golden Member

The public documents are somewhat stripped, however what comes in configuring the power management or programming the system management unit (SMU) the NDA and the public contain the same information (none) D:

Senior member

No rush, but its very great CPU for SUperpi. Mr Chew* or mr Stilt must to find 70 dollars and buy this CPU for late evenings :up:

I had IDE mode and the issue of this piece was IDE BCLK black screen. I tried another ways as lower RAM, lower APUNB or higher voltages at SB, VDDNB, CPU and doesnt change the issue. So this was my highest stable BCLK. I believe piece of piece of 845 Athlon will be little different. Maybe PCIe card slot with M2 could be solution (into the last PCIe x4 slot). Friend told me, old HDD raptor is more SATA stable also. I used SSD.
Seems CPU si scaling very well. Next time I must tweak the OS or to use XP for SUperpi. Clear 10 minutes is with these CPU/CPUNB clocks doable. Interesting, for this CPUNB was OK only around 1.17V! I dont tested, if CPU has coldbug or not. With few liters of LN2 I left around -50 C temperatures.

Lifer

btw you don't need to go as expensive as NVMe harddrives or whatever, you can just grab a cheap PCIe SATA controller and try that. Though some of those get cranky at higher PCIe speeds. The cheap-arse one I bought (that has since burned out) was good for bclk up to 119 MHz.

Golden Member

Steamroller (Kaveri / Godavari) is / was made on GF28A, which is a tuned (custom) version of the standard GF28HPP. They are both bulk nodes, since GlobalFoundries cancelled their plans for SOI 28nm process (GF28SHP).

Member

Steamroller (Kaveri / Godavari) is / was made on GF28A, which is a tuned (custom) version of the standard GF28HPP. They are both bulk nodes, since GlobalFoundries cancelled their plans for SOI 28nm process (GF28SHP).

Golden Member

I have no idea what the price difference was, to be honest. I would imagine that GlobalFoundries felt pressure about increasing the prices for GF28A parts due the already low and still declining demand. Afterall only a single design was ever manufactured using the process so having a separate production line for a low volume product is not necessarily too cost effective.

Platinum Member

I have no idea what the price difference was, to be honest. I would imagine that GlobalFoundries felt pressure about increasing the prices for GF28A parts due the already low and still declining demand. Afterall only a single design was ever manufactured using the process so having a separate production line for a low volume product is not necessarily too cost effective.